The UK often has parades for a number of reasons — soldiers returning home, official inspection ceremonies, and royal events like Queen Elizabeth's birthday.
Traditional uniforms are usually worn for these events.
France has a military parade every year on July 14 to celebrate Bastille Day.
Trump went to the Bastille Day Parade in 2017, which reportedly inspired him to have one in the US.
Russia holds a military parade every year on May 9 to celebrate the end of WWII, or as they call it, the Great Patriotic War.
The Russians have used this parade to show off new equipment, like the T-14 Armata tanks in 2015.
The Victory Day Parade also involves a flyover of Russian jets.
India holds a military parade every year on January 26 to mark the adoption of the Constitution of India.
This parade is usually used to intimidate Pakistan.
But it's also an opportunity to show off.
Iran holds a military parade to commemorate the Iran-Iraq war.
It often uses these parades to show hatred of the West, particularly the US.
Saudi Arabia has started to hold parades as its military becomes more modern.
Sometimes those parades involve actual combat drills, as seen here.
China has perhaps the most extravagant military parades. This parade in 2017 involved 12,000 troops, 129 aircraft, and over 500 tanks, missile launchers, and other vehicles.
But Chinese military parades are usually held in front of the Tiananmen Gate, and celebrate events like the foundation of the Peoples Republic of China.
North Korea is notorious for its military parades.
The actual military equipment on display is usually not intimidating, as most of it dates back to the Cold War.
But the one thing that does give a moment of pause is the display of their missiles. The US has not displayed its nuclear missiles at parades since the middle of the Cold War.
North Korea is not the only nation to flaunt its missiles. China often displays a number of different models at their parades.
As does Russia during its Victory Day Parade.
